forked from luck/tmp_suning_uos_patched
KVM: PPC: Book3S: Add support for ibm,int-on/off RTAS calls
This adds support for the ibm,int-on and ibm,int-off RTAS calls to the in-kernel XICS emulation and corrects the handling of the saved priority by the ibm,set-xive RTAS call. With this, ibm,int-off sets the specified interrupt's priority in its saved_priority field and sets the priority to 0xff (the least favoured value). ibm,int-on restores the saved_priority to the priority field, and ibm,set-xive sets both the priority and the saved_priority to the specified priority value. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
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4619ac88b7
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@ -174,6 +174,8 @@ extern int kvmppc_xics_set_xive(struct kvm *kvm, u32 irq, u32 server,
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u32 priority);
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extern int kvmppc_xics_get_xive(struct kvm *kvm, u32 irq, u32 *server,
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u32 *priority);
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extern int kvmppc_xics_int_on(struct kvm *kvm, u32 irq);
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extern int kvmppc_xics_int_off(struct kvm *kvm, u32 irq);
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/*
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* Cuts out inst bits with ordering according to spec.
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@ -63,6 +63,44 @@ static void kvm_rtas_get_xive(struct kvm_vcpu *vcpu, struct rtas_args *args)
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out:
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args->rets[0] = rc;
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}
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static void kvm_rtas_int_off(struct kvm_vcpu *vcpu, struct rtas_args *args)
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{
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u32 irq;
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int rc;
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if (args->nargs != 1 || args->nret != 1) {
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rc = -3;
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goto out;
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}
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irq = args->args[0];
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rc = kvmppc_xics_int_off(vcpu->kvm, irq);
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if (rc)
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rc = -3;
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out:
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args->rets[0] = rc;
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}
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static void kvm_rtas_int_on(struct kvm_vcpu *vcpu, struct rtas_args *args)
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{
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u32 irq;
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int rc;
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if (args->nargs != 1 || args->nret != 1) {
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rc = -3;
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goto out;
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}
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irq = args->args[0];
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rc = kvmppc_xics_int_on(vcpu->kvm, irq);
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if (rc)
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rc = -3;
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out:
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args->rets[0] = rc;
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}
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#endif /* CONFIG_KVM_XICS */
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struct rtas_handler {
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@ -74,6 +112,8 @@ static struct rtas_handler rtas_handlers[] = {
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#ifdef CONFIG_KVM_XICS
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{ .name = "ibm,set-xive", .handler = kvm_rtas_set_xive },
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{ .name = "ibm,get-xive", .handler = kvm_rtas_get_xive },
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{ .name = "ibm,int-off", .handler = kvm_rtas_int_off },
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{ .name = "ibm,int-on", .handler = kvm_rtas_int_on },
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#endif
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};
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@ -123,6 +123,28 @@ static void ics_check_resend(struct kvmppc_xics *xics, struct kvmppc_ics *ics,
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mutex_unlock(&ics->lock);
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}
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static bool write_xive(struct kvmppc_xics *xics, struct kvmppc_ics *ics,
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struct ics_irq_state *state,
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u32 server, u32 priority, u32 saved_priority)
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{
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bool deliver;
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mutex_lock(&ics->lock);
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state->server = server;
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state->priority = priority;
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state->saved_priority = saved_priority;
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deliver = false;
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if ((state->masked_pending || state->resend) && priority != MASKED) {
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state->masked_pending = 0;
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deliver = true;
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}
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mutex_unlock(&ics->lock);
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return deliver;
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}
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int kvmppc_xics_set_xive(struct kvm *kvm, u32 irq, u32 server, u32 priority)
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{
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struct kvmppc_xics *xics = kvm->arch.xics;
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@ -130,7 +152,6 @@ int kvmppc_xics_set_xive(struct kvm *kvm, u32 irq, u32 server, u32 priority)
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struct kvmppc_ics *ics;
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struct ics_irq_state *state;
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u16 src;
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bool deliver;
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if (!xics)
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return -ENODEV;
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@ -144,23 +165,11 @@ int kvmppc_xics_set_xive(struct kvm *kvm, u32 irq, u32 server, u32 priority)
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if (!icp)
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return -EINVAL;
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mutex_lock(&ics->lock);
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XICS_DBG("set_xive %#x server %#x prio %#x MP:%d RS:%d\n",
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irq, server, priority,
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state->masked_pending, state->resend);
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state->server = server;
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state->priority = priority;
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deliver = false;
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if ((state->masked_pending || state->resend) && priority != MASKED) {
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state->masked_pending = 0;
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deliver = true;
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}
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mutex_unlock(&ics->lock);
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if (deliver)
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if (write_xive(xics, ics, state, server, priority, priority))
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icp_deliver_irq(xics, icp, irq);
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return 0;
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@ -189,6 +198,53 @@ int kvmppc_xics_get_xive(struct kvm *kvm, u32 irq, u32 *server, u32 *priority)
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return 0;
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}
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int kvmppc_xics_int_on(struct kvm *kvm, u32 irq)
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{
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struct kvmppc_xics *xics = kvm->arch.xics;
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struct kvmppc_icp *icp;
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struct kvmppc_ics *ics;
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struct ics_irq_state *state;
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u16 src;
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if (!xics)
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return -ENODEV;
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ics = kvmppc_xics_find_ics(xics, irq, &src);
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if (!ics)
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return -EINVAL;
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state = &ics->irq_state[src];
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icp = kvmppc_xics_find_server(kvm, state->server);
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if (!icp)
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return -EINVAL;
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if (write_xive(xics, ics, state, state->server, state->saved_priority,
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state->saved_priority))
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icp_deliver_irq(xics, icp, irq);
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return 0;
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}
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int kvmppc_xics_int_off(struct kvm *kvm, u32 irq)
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{
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struct kvmppc_xics *xics = kvm->arch.xics;
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struct kvmppc_ics *ics;
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struct ics_irq_state *state;
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u16 src;
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if (!xics)
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return -ENODEV;
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ics = kvmppc_xics_find_ics(xics, irq, &src);
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if (!ics)
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return -EINVAL;
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state = &ics->irq_state[src];
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write_xive(xics, ics, state, state->server, MASKED, state->priority);
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return 0;
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}
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/* -- ICP routines, including hcalls -- */
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static inline bool icp_try_update(struct kvmppc_icp *icp,
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@ -36,7 +36,7 @@ struct ics_irq_state {
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u32 number;
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u32 server;
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u8 priority;
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u8 saved_priority; /* currently unused */
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u8 saved_priority;
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u8 resend;
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u8 masked_pending;
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u8 asserted; /* Only for LSI */
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